SIL: add some APIs for InitExistentialAddrInst

* `var conformances: ConformanceArray`
* `var formalConcreteType: CanonicalType`

Author: eeckstein

SwiftCompilerSources/Sources/SIL/Instruction.swift

@@ -879,7 +879,15 @@ final public
 class OpenExistentialValueInst : SingleValueInstruction, UnaryInstruction {}
 
 final public
-class InitExistentialAddrInst : SingleValueInstruction, UnaryInstruction {}
+class InitExistentialAddrInst : SingleValueInstruction, UnaryInstruction {
+  public var conformances: ConformanceArray {
+    ConformanceArray(bridged: bridged.InitExistentialAddrInst_getConformances())
+  }
+
+  public var formalConcreteType: CanonicalType {
+    CanonicalType(bridged: bridged.InitExistentialAddrInst_getFormalConcreteType())
+  }
+}
 
 final public
 class DeinitExistentialAddrInst : Instruction, UnaryInstruction {}

include/swift/SIL/SILBridging.h

@@ -796,6 +796,8 @@ struct BridgedInstruction {
   BRIDGED_INLINE bool IndexAddrInst_needsStackProtection() const;
   SWIFT_IMPORT_UNSAFE BRIDGED_INLINE BridgedConformanceArray InitExistentialRefInst_getConformances() const;
   SWIFT_IMPORT_UNSAFE BRIDGED_INLINE BridgedCanType InitExistentialRefInst_getFormalConcreteType() const;
+  SWIFT_IMPORT_UNSAFE BRIDGED_INLINE BridgedConformanceArray InitExistentialAddrInst_getConformances() const;
+  SWIFT_IMPORT_UNSAFE BRIDGED_INLINE BridgedCanType InitExistentialAddrInst_getFormalConcreteType() const;
   BRIDGED_INLINE bool OpenExistentialAddr_isImmutable() const;
   SWIFT_IMPORT_UNSAFE BRIDGED_INLINE BridgedGlobalVar GlobalAccessInst_getGlobal() const;
   SWIFT_IMPORT_UNSAFE BRIDGED_INLINE BridgedGlobalVar AllocGlobalInst_getGlobal() const;

include/swift/SIL/SILBridgingImpl.h

@@ -1245,6 +1245,14 @@ BridgedCanType BridgedInstruction::InitExistentialRefInst_getFormalConcreteType(
   return getAs<swift::InitExistentialRefInst>()->getFormalConcreteType();
 }
 
+BridgedConformanceArray BridgedInstruction::InitExistentialAddrInst_getConformances() const {
+  return {getAs<swift::InitExistentialAddrInst>()->getConformances()};
+}
+
+BridgedCanType BridgedInstruction::InitExistentialAddrInst_getFormalConcreteType() const {
+  return getAs<swift::InitExistentialAddrInst>()->getFormalConcreteType();
+}
+
 bool BridgedInstruction::OpenExistentialAddr_isImmutable() const {
   switch (getAs<swift::OpenExistentialAddrInst>()->getAccessKind()) {
     case swift::OpenedExistentialAccess::Immutable: return true;