Revert "Enable MSA feature by default for MIPS cpus i6400 and i6500"

This reverts commit f1b35e8.

Author: mgoudar

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

@@ -1,9 +1,9 @@
 // Check target CPUs are correctly passed.
 
-// RUN: %clang --target=mips64 -### -c %s 2>&1 -mcpu=i6400 | FileCheck -check-prefix=MCPU-I6400 %s
+// RUN: %clang --target=mips64 -### -c %s 2>&1 -mcpu=i6400 -mmsa | FileCheck -check-prefix=MCPU-I6400 %s
 // MCPU-I6400: "-target-cpu" "i6400"
-// MCPU-I6400: "-target-feature" "+msa" "-target-feature" "-noabicalls"
+// MCPU-I6400-SAME: "-target-feature" "+msa"
 
-// RUN: %clang --target=mips64 -### -c %s 2>&1 -mcpu=i6500 | FileCheck -check-prefix=MCPU-I6500 %s
+// RUN: %clang --target=mips64 -### -c %s 2>&1 -mcpu=i6500 -mmsa | FileCheck -check-prefix=MCPU-I6500 %s
 // MCPU-I6500: "-target-cpu" "i6500"
-// MCPU-I6500: "-target-feature" "+msa" "-target-feature" "-noabicalls"
+// MCPU-I6500-SAME: "-target-feature" "+msa"