[X86] Add missing feature USERMSR to DiamondRapids (#120061)

Ref.: https://cdrdv2.intel.com/v1/dl/getContent/671368

Author: phoebewang

clang/test/Preprocessor/predefined-arch-macros.c

@@ -1953,6 +1953,8 @@
 // CHECK_GNR_M32: #define __SSSE3__ 1
 // CHECK_GNR_M32: #define __TSXLDTRK__ 1
 // CHECK_GNR_M32: #define __UINTR__ 1
+// CHECK_GNR_M32-NOT: #define __USERMSR__ 1
+// CHECK_DMR_M32: #define __USERMSR__ 1
 // CHECK_GNR_M32: #define __VAES__ 1
 // CHECK_GNR_M32: #define __VPCLMULQDQ__ 1
 // CHECK_GNR_M32: #define __WAITPKG__ 1
@@ -2061,6 +2063,8 @@
 // CHECK_GNR_M64: #define __SSSE3__ 1
 // CHECK_GNR_M64: #define __TSXLDTRK__ 1
 // CHECK_GNR_M64: #define __UINTR__ 1
+// CHECK_GNR_M64-NOT: #define __USERMSR__ 1
+// CHECK_DMR_M64: #define __USERMSR__ 1
 // CHECK_GNR_M64: #define __VAES__ 1
 // CHECK_GNR_M64: #define __VPCLMULQDQ__ 1
 // CHECK_GNR_M64: #define __WAITPKG__ 1

llvm/lib/Target/X86/X86.td

@@ -1163,6 +1163,7 @@ def ProcessorFeatures {
                                                   FeatureAVXNECONVERT,
                                                   FeatureAVXVNNIINT8,
                                                   FeatureAVXVNNIINT16,
+                                                  FeatureUSERMSR,
                                                   FeatureSHA512,
                                                   FeatureSM3,
                                                   FeatureEGPR,

llvm/lib/TargetParser/X86TargetParser.cpp

@@ -145,7 +145,7 @@ constexpr FeatureBitset FeaturesDiamondRapids =
     FeatureSM4 | FeatureEGPR | FeatureZU | FeatureCCMP | FeaturePush2Pop2 |
     FeaturePPX | FeatureNDD | FeatureNF | FeatureCF | FeatureMOVRS |
     FeatureAMX_MOVRS | FeatureAMX_AVX512 | FeatureAMX_FP8 | FeatureAMX_TF32 |
-    FeatureAMX_TRANSPOSE;
+    FeatureAMX_TRANSPOSE | FeatureUSERMSR;
 
 // Intel Atom processors.
 // Bonnell has feature parity with Core2 and adds MOVBE.