Bug 1914979 - Don't mark v8-v15 arm64 SIMD registers as non-volatile. r=yury

Only the bottom 64 bits will be preserved by C++ code so we shouldn't treat the SIMD registers
as non-volatile.

The patch in bug 1919803 has a Wasm test for this.

Differential Revision: https://phabricator.services.mozilla.com/D225646

js/src/jit/arm64/Architecture-arm64.h

@@ -491,10 +491,10 @@ class FloatRegisters {
               (1 << FloatRegisters::s12) | (1 << FloatRegisters::s13) |
               (1 << FloatRegisters::s14) | (1 << FloatRegisters::s15));
 
+  // Note: only the bottom 64 bits of v8-v15 will be preserved.
   static constexpr SetType NonVolatileMask =
       (NonVolatileSingleMask << ShiftSingle) |
-      (NonVolatileSingleMask << ShiftDouble) |
-      (NonVolatileSingleMask << ShiftSimd128);
+      (NonVolatileSingleMask << ShiftDouble);
 
   static constexpr SetType VolatileMask = AllMask & ~NonVolatileMask;