[wasm] Enable intrinsification of math imports

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R=mstarzinger@chromium.org

Bug: v8:8423
Change-Id: I59ee8c49c2f0323a32e8c7e6c9cf8d929b4a8bb4
Reviewed-on: https://chromium-review.googlesource.com/c/1349239
Commit-Queue: Ben Titzer <titzer@chromium.org>
Reviewed-by: Michael Starzinger <mstarzinger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#57844}

src/flag-definitions.h

@@ -608,7 +608,7 @@ DEFINE_BOOL(wasm_no_bounds_checks, false,
             "disable bounds checks (performance testing only)")
 DEFINE_BOOL(wasm_no_stack_checks, false,
             "disable stack checks (performance testing only)")
-DEFINE_BOOL(wasm_math_intrinsics, false,
+DEFINE_BOOL(wasm_math_intrinsics, true,
             "intrinsify some Math imports into wasm")
 
 DEFINE_BOOL(wasm_shared_engine, true,