Introduces a new macro BUILD_V (v is for vector) that pushes bytes into
a vector (instead of directly in an array initializer, see BUILD). This
has the positive effect of being able to handle opcodes of multiple
bytes (e.g. SIMD opcodes bigger that 0xfd80). Because of this "API"
change, our helper macros in test-run-wasm-simd.cc and wasm-run-utils.h
need to change too. So, we introduce new macros (suffixed by _V), that
will call the appropriate lambdas defined in BUILD_V, that knows how to
push bytes into the vector, and also can handle multi-byte opcodes.

This design has a bit of duplication and ugliness, but was chosen to
reduce the impact of existing tests. No restructuring of test code is
required, we only need to add suffix _V.

Note that we do not have multi-byte opcodes yet (in wasm-opcodes.h),
this change will be breaking, and requires all the tests to be updated
to use _V macros first.

Bug: v8:10258
Change-Id: I86638a548fe2f9714c1cfb3bd691fb7b49bfd652
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2107650
Commit-Queue: Zhi An Ng <zhin@chromium.org>
Reviewed-by: Clemens Backes <clemensb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#66812}