[DebugInfo][test] Change two MIR tests to use -start-before=livedebugvalues instead of -start-after=patchable-function

To break order dependency between livedebugvalues and patchable-function.

(cherry picked from commit 26ba1f7)

Author: MaskRay

llvm/test/DebugInfo/ARM/cfi-eof-prologue.mir

@@ -1,5 +1,5 @@
-# RUN: llc -o - %s -mtriple=thumbv7-apple-ios -start-after=patchable-function | FileCheck %s
-# RUN: llc -o - %s -mtriple=thumbv6-apple-ios -start-after=patchable-function | FileCheck %s
+# RUN: llc -o - %s -mtriple=thumbv7-apple-ios -start-before=livedebugvalues | FileCheck %s
+# RUN: llc -o - %s -mtriple=thumbv6-apple-ios -start-before=livedebugvalues | FileCheck %s
 
 # struct A {
 #   A();

llvm/test/DebugInfo/X86/debug-loc-asan.mir

@@ -1,5 +1,5 @@
-# RUN: llc -o - %s -start-after=patchable-function -O0 -mtriple=x86_64-unknown-linux-gnu | FileCheck %s
-# RUN: llc -o - %s -start-after=patchable-function  -O0 -mtriple=x86_64-unknown-linux-gnu -filetype=obj \
+# RUN: llc -o - %s -start-after=livedebugvalues -O0 -mtriple=x86_64-unknown-linux-gnu | FileCheck %s
+# RUN: llc -o - %s -start-after=livedebugvalues  -O0 -mtriple=x86_64-unknown-linux-gnu -filetype=obj \
 # RUN:   | llvm-dwarfdump -debug-info - | FileCheck %s --check-prefix=DWARF
 #
 # Verify that we have correct debug info for local variables in code