Revert "[MIPS] Add FeatureMSA to i6400 and i6500 cores (llvm#134985)"

This reverts commit 55a88cd.

Breaks Sanitizer bot: https://lab.llvm.org/buildbot/#/builders/94/builds/6923

Author: kstoimenov

clang/lib/Driver/ToolChains/Arch/Mips.cpp

@@ -255,12 +255,6 @@ void mips::getMIPSTargetFeatures(const Driver &D, const llvm::Triple &Triple,
     D.Diag(diag::err_drv_unsupported_noabicalls_pic);
   }
 
-  if (CPUName == "i6500" || CPUName == "i6400") {
-    // MIPS cpu i6400 and i6500 support MSA (Mips SIMD Architecture)
-    // by default.
-    Features.push_back("+msa");
-  }
-
   if (!UseAbiCalls)
     Features.push_back("+noabicalls");
   else

clang/test/Driver/mips-cpus.c

@@ -243,11 +243,11 @@ def ImplP5600 : SubtargetFeature<"p5600", "ProcImpl",
 // same CPU architecture.
 def ImplI6400
     : SubtargetFeature<"i6400", "ProcImpl", "MipsSubtarget::CPU::I6400",
-                       "MIPS I6400 Processor", [FeatureMips64r6, FeatureMSA]>;
+                       "MIPS I6400 Processor", [FeatureMips64r6]>;
 
 def ImplI6500
     : SubtargetFeature<"i6500", "ProcImpl", "MipsSubtarget::CPU::I6500",
-                       "MIPS I6500 Processor", [FeatureMips64r6, FeatureMSA]>;
+                       "MIPS I6500 Processor", [FeatureMips64r6]>;
 
 class Proc<string Name, list<SubtargetFeature> Features>
  : ProcessorModel<Name, MipsGenericModel, Features>;

llvm/lib/Target/Mips/Mips.td

@@ -1,8 +1,6 @@
 ; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
 ; RUN: llc -mtriple=mips -mattr=+msa,+fp64,+mips32r2 < %s | FileCheck %s --check-prefixes=ALL,MIPS
 ; RUN: llc -mtriple=mipsel -mattr=+msa,+fp64,+mips32r2 < %s | FileCheck %s --check-prefixes=ALL,MIPSEL
-; RUN: llc -mtriple=mips64 -mcpu=i6500 < %s | FileCheck %s --check-prefixes=ALL
-; RUN: llc -mtriple=mips64 -mcpu=i6400 < %s | FileCheck %s --check-prefixes=ALL
 
 define void @add_v16i8(ptr %c, ptr %a, ptr %b) nounwind {
 ; ALL-LABEL: add_v16i8: