[MIPS] Recognize DT_MIPS_XHASH dynamic table tag

LLVM tools do not emit `DT_MIPS_XHASH` dynamic table tag. But now
`llvm-objdump` and `llvm-readelf` recognize this tag and print it.

Fixes #53996

(cherry picked from commit 3c840e3)

Author: atanasyan

llvm/include/llvm/BinaryFormat/DynamicTags.def

@@ -209,6 +209,7 @@ MIPS_DYNAMIC_TAG(MIPS_RWPLT, 0x70000034)        // Points to the base
                                                 // of a writable PLT.
 MIPS_DYNAMIC_TAG(MIPS_RLD_MAP_REL, 0x70000035)  // Relative offset of run time loader
                                                 // map, used for debugging.
+MIPS_DYNAMIC_TAG(MIPS_XHASH, 0x70000036)        // GNU-style hash table with xlat.
 
 // PPC specific dynamic table entries.
 PPC_DYNAMIC_TAG(PPC_GOT, 0x70000000) // Uses Secure PLT ABI.

llvm/test/tools/llvm-objdump/ELF/dynamic-section-machine-specific.test

@@ -86,6 +86,7 @@ ProgramHeaders:
 # MIPS-NEXT:  MIPS_PLTGOT                0x0000000000001000
 # MIPS-NEXT:  MIPS_RWPLT                 0x0000000000001000
 # MIPS-NEXT:  MIPS_RLD_MAP_REL           0x0000000000001000
+# MIPS-NEXT:  MIPS_XHASH                 0x0000000000002000
 
 --- !ELF
 FileHeader:
@@ -187,6 +188,8 @@ Sections:
         Value: 0x1000
       - Tag:   DT_MIPS_RLD_MAP_REL
         Value: 0x1000
+      - Tag:   DT_MIPS_XHASH
+        Value: 0x2000
       - Tag:   DT_NULL
         Value: 0
 ProgramHeaders:

llvm/test/tools/llvm-readobj/ELF/dynamic-tags-machine-specific.test

@@ -53,7 +53,7 @@ ProgramHeaders:
 # RUN: llvm-readelf --dynamic-table %t.mips \
 # RUN:  | FileCheck %s --strict-whitespace --match-full-lines --check-prefix=GNU-MIPS
 
-#      LLVM-MIPS:DynamicSection [ (47 entries)
+#      LLVM-MIPS:DynamicSection [ (48 entries)
 # LLVM-MIPS-NEXT:  Tag                Type                       Name/Value
 # LLVM-MIPS-NEXT:  0x0000000000000004 HASH                       0x1000
 # LLVM-MIPS-NEXT:  0x0000000070000001 MIPS_RLD_VERSION           305419896
@@ -101,10 +101,11 @@ ProgramHeaders:
 # LLVM-MIPS-NEXT:  0x0000000070000032 MIPS_PLTGOT                0x1000
 # LLVM-MIPS-NEXT:  0x0000000070000034 MIPS_RWPLT                 0x1000
 # LLVM-MIPS-NEXT:  0x0000000070000035 MIPS_RLD_MAP_REL           0x1000
+# LLVM-MIPS-NEXT:  0x0000000070000036 MIPS_XHASH                 0x2000
 # LLVM-MIPS-NEXT:  0x0000000000000000 NULL                       0x0
 # LLVM-MIPS-NEXT:]
 
-#      GNU-MIPS:Dynamic section at offset {{.*}} contains 47 entries:
+#      GNU-MIPS:Dynamic section at offset {{.*}} contains 48 entries:
 # GNU-MIPS-NEXT:  Tag                Type                         Name/Value
 # GNU-MIPS-NEXT:  0x0000000000000004 (HASH)                       0x1000
 # GNU-MIPS-NEXT:  0x0000000070000001 (MIPS_RLD_VERSION)           305419896
@@ -152,6 +153,7 @@ ProgramHeaders:
 # GNU-MIPS-NEXT:  0x0000000070000032 (MIPS_PLTGOT)                0x1000
 # GNU-MIPS-NEXT:  0x0000000070000034 (MIPS_RWPLT)                 0x1000
 # GNU-MIPS-NEXT:  0x0000000070000035 (MIPS_RLD_MAP_REL)           0x1000
+# GNU-MIPS-NEXT:  0x0000000070000036 (MIPS_XHASH)                 0x2000
 # GNU-MIPS-NEXT:  0x0000000000000000 (NULL)                       0x0
 
 --- !ELF
@@ -256,6 +258,8 @@ Sections:
         Value: 0x1000
       - Tag:   DT_MIPS_RLD_MAP_REL
         Value: 0x1000
+      - Tag:   DT_MIPS_XHASH
+        Value: 0x2000
       - Tag:   DT_NULL
         Value: 0
 ProgramHeaders:

llvm/test/tools/obj2yaml/ELF/dynamic-section-arch-tags.yaml

@@ -97,6 +97,8 @@
 # MIPS-NEXT:   Value:           0x2D
 # MIPS-NEXT: - Tag:             DT_MIPS_RLD_MAP_REL
 # MIPS-NEXT:   Value:           0x2E
+# MIPS-NEXT: - Tag:             DT_MIPS_XHASH
+# MIPS-NEXT:   Value:           0x2F
 
 --- !ELF
 FileHeader:
@@ -200,6 +202,8 @@ Sections:
         Value:           0x000000000000002D
       - Tag:             DT_MIPS_RLD_MAP_REL
         Value:           0x000000000000002E
+      - Tag:             DT_MIPS_XHASH
+        Value:           0x000000000000002F
 
 ## Check we can handle Hexagon specific tags.
 # RUN: yaml2obj --docnum=2 %s -o %t2

llvm/tools/llvm-readobj/ELFDumper.cpp

@@ -2265,6 +2265,7 @@ std::string ELFDumper<ELFT>::getDynamicEntry(uint64_t Type,
     case DT_MIPS_PLTGOT:
     case DT_MIPS_RWPLT:
     case DT_MIPS_RLD_MAP_REL:
+    case DT_MIPS_XHASH:
       return FormatHexValue(Value);
     case DT_MIPS_FLAGS:
       return FormatFlags(Value, makeArrayRef(ElfDynamicDTMipsFlags));