[mips][mips64]: Skip tests for MIPS release 6.

For MIPS architecture release 6, following tests will be skipped:
cctest/test-run-machops/RunFloat64MulAndFloat64Add1
cctest/test-run-machops/RunFloat64MulAndFloat64Add2
cctest/test-run-machops/RunFloat64MulAndFloat64Sub1
cctest/test-run-machops/RunFloat64MulAndFloat64Sub2

TEST=
BUG=

Change-Id: Id359580b809d1387d504d98b6d25d6c112cfda78
Reviewed-on: https://chromium-review.googlesource.com/945689Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Ivica Bogosavljevic <ivica.bogosavljevic@mips.com>
Cr-Commit-Position: refs/heads/master@{#51754}

test/cctest/cctest.status

@@ -371,6 +371,17 @@
   'test-run-wasm-simd/RunWasm_ReductionTest16_compiled': [SKIP],
 }],  # '(arch == mipsel or arch == mips64el or arch == mips or arch == mips64) and not simd_mips'
 
+##############################################################################
+['mips_arch_variant == r6', {
+  # For MIPS[64] architecture release 6, fusion multiply-accumulate instructions
+  # will cause failures on several tests that expect exact floating-point
+  # results.
+  'test-run-machops/RunFloat64MulAndFloat64Add1': [SKIP],
+  'test-run-machops/RunFloat64MulAndFloat64Add2': [SKIP],
+  'test-run-machops/RunFloat64MulAndFloat64Sub1': [SKIP],
+  'test-run-machops/RunFloat64MulAndFloat64Sub2': [SKIP],
+}],  # 'mips_arch_variant == r6'
+
 ##############################################################################
 ['arch == android_arm or arch == android_ia32', {
 

tools/testrunner/local/statusfile.py

@@ -59,7 +59,7 @@ for var in ["debug", "release", "big", "little",
             "android_arm", "android_arm64", "android_ia32", "android_x64",
             "arm", "arm64", "ia32", "mips", "mipsel", "mips64", "mips64el",
             "x64", "ppc", "ppc64", "s390", "s390x", "macos", "windows",
-            "linux", "aix"]:
+            "linux", "aix", "r1", "r2", "r3", "r5", "r6"]:
   VARIABLES[var] = var
 
 # Allow using variants as keywords.