Bug 1520478 Comment 1 Edit History

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Initial implementation, for perusal.  It works well enough to survive
```
 JS_GC_ZEAL=2,100 \
   ../src/jit-test/jit_test.py -f ./dist/bin/js --args="--no-wasm-ion" wasm/gc
```
and
```
 ../src/jit-test/jit_test.py -f ./dist/bin/js wasm
```
for arm{32,64} and x86_{32,64}.
Initial implementation, for perusal.  It works well enough to survive
```
 JS_GC_ZEAL=2,100 \
   ../src/jit-test/jit_test.py -f ./dist/bin/js --args="--no-wasm-ion" wasm/gc
```
and
```
 ../src/jit-test/jit_test.py -f ./dist/bin/js wasm
```
for arm{32,64} and x86_{32,64}.

WIP patch; there are 6 commented uses of ```MIRType::Pointer``` that are probably
correct but are in need of further checking.

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