Fix SILBridging for GlobalAddr_getDecl

and RefElementAddr_getDecl.

Fixes:
Assertion failed: (isa<To>(Val) && "cast<Ty>() argument of incompatible type!"), function cast, file Casting.h

While running pass swiftlang#224 SILFunctionTransform "LifetimeDependenceDiagnostics"
 swiftlang#7 0x0000000102d3efcc decltype(auto) llvm::cast<swift::DebugValueInst, swift::SILInstruction>(swift::SILInstruction*)
 swiftlang#8 0x0000000102d01e24 swift::DebugValueInst* BridgedInstruction::getAs<swift::DebugValueInst>() const
 swiftlang#9 0x0000000102d01ee4 BridgedInstruction::GlobalAddr_getDecl() const

Author: atrick

include/swift/SIL/SILBridgingImpl.h

@@ -1362,11 +1362,11 @@ BridgedNullableVarDecl BridgedInstruction::AllocBox_getDecl() const {
 }
 
 BridgedNullableVarDecl BridgedInstruction::GlobalAddr_getDecl() const {
-  return {getAs<swift::DebugValueInst>()->getDecl()};
+  return {getAs<swift::GlobalAddrInst>()->getReferencedGlobal()->getDecl()};
 }
 
 BridgedNullableVarDecl BridgedInstruction::RefElementAddr_getDecl() const {
-  return {getAs<swift::DebugValueInst>()->getDecl()};
+  return {getAs<swift::RefElementAddrInst>()->getField()};
 }
 
 OptionalBridgedSILDebugVariable