[Wasm GC] Global Refining pass (#4344)

Fairly simple, this uses the existing infrastructure to find opportunities
to refine the type of a global variable. This a common pattern in j2wasm
for example, where a global begins as a null of $java.lang.Object (the
least specific type) but it is in practice always assigned an object of
some specific type.

1 files changed, 1 insertions, 0 deletions

diff --git a/src/passes/passes.h b/src/passes/passes.h
index e8e8ecc78..5a67b1d82 100644
--- a/src/passes/passes.h
+++ b/src/passes/passes.h
@@ -51,6 +51,7 @@ Pass* createFunctionMetricsPass();
 Pass* createGenerateDynCallsPass();
 Pass* createGenerateI64DynCallsPass();
 Pass* createGenerateStackIRPass();
+Pass* createGlobalRefiningPass();
 Pass* createGlobalTypeOptimizationPass();
 Pass* createHeap2LocalPass();
 Pass* createI64ToI32LoweringPass();