SIMD.js Fix x87 build. Rename method EmitIsSpecObject -> EmitIsSimdObject.
SIMD.js Fix x87 build.
Rename method EmitIsSpecObject -> EmitIsSimdObject.

LOG=N
BUG=v8:4124

Review URL: https://codereview.chromium.org/1263473008

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#29980}

UniversalFuture/moosh,UniversalFuture/moosh,UniversalFuture/moosh,UniversalFuture/moosh