[simd] Disable Simd Scalar lowering for x64, enable tests for all other architectures.

test/cctest/BUILD.gn

Index: test/cctest/BUILD.gn
diff --git a/test/cctest/BUILD.gn b/test/cctest/BUILD.gn
index 3c343ae4931f095d147a85b420d4fab8c01e5e3b..1a125113f7866874de2bf3d5d42d7a2543e19a70 100644
--- a/test/cctest/BUILD.gn
+++ b/test/cctest/BUILD.gn
@@ -190,6 +190,7 @@ v8_executable("cctest") {
     "wasm/test-run-wasm-js.cc",
     "wasm/test-run-wasm-module.cc",
     "wasm/test-run-wasm-relocation.cc",
+    "wasm/test-run-wasm-simd-lowering.cc",
     "wasm/test-run-wasm.cc",
     "wasm/test-wasm-stack.cc",
     "wasm/test-wasm-trap-position.cc",
@@ -277,7 +278,6 @@ v8_executable("cctest") {
       "test-log-stack-tracer.cc",
       "test-macro-assembler-x64.cc",
       "test-run-wasm-relocation-x64.cc",
-      "wasm/test-run-wasm-simd-lowering.cc",
       "wasm/test-run-wasm-simd.cc",
     ]

[bbudge, 2016/11/18 19:30:59]

You can remove the lowering tests from sources here, i.e.
sources -= [
  "wasm/test-run-wasm-simd-lowering.cc"
]

Then you don't have to comment out the tests for archs that support SIMD without
lowering.

Alternatively we could only add this file to sources for platforms that don't
support SIMD, which is all of them except x64 right now. That might be the
clearest, although it's more verbose.

[gdeepti, 2016/11/21 19:30:02]

I was not sure which way was cleaner as most architectures currently do not
support SIMD, and this particular test file had no architecture specific
functionality. Fixed to add to sources only for platforms that do not support
SIMD. 

   } else if (v8_current_cpu == "x87") {