Enable MSA feature by default for MIPS cpus i6400 and i6500

MIPS cpus support MSA by default. So enable this feature
for cpus i6400 and i6500.

Also test msa feature in mips-cpus.c driver test case

Author: mgoudar

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

@@ -255,6 +255,12 @@ 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 -mmsa | FileCheck -check-prefix=MCPU-I6400 %s
+// RUN: %clang --target=mips64 -### -c %s 2>&1 -mcpu=i6400 | FileCheck -check-prefix=MCPU-I6400 %s
 // MCPU-I6400: "-target-cpu" "i6400"
-// MCPU-I6400-SAME: "-target-feature" "+msa"
+// MCPU-I6400: "-target-feature" "+msa" "-target-feature" "-noabicalls"
 
-// RUN: %clang --target=mips64 -### -c %s 2>&1 -mcpu=i6500 -mmsa | FileCheck -check-prefix=MCPU-I6500 %s
+// RUN: %clang --target=mips64 -### -c %s 2>&1 -mcpu=i6500 | FileCheck -check-prefix=MCPU-I6500 %s
 // MCPU-I6500: "-target-cpu" "i6500"
-// MCPU-I6500-SAME: "-target-feature" "+msa"
+// MCPU-I6500: "-target-feature" "+msa" "-target-feature" "-noabicalls"