[Remangler] Fix remangling of items in static bound generic function context

If you had a type alias (for instance) with its context set to a static
bound generic function, the generic arguments were remangled in the wrong
place because Node::Kind::Static wasn't handled properly in a couple of
functions.  Fix that.

rdar://82870372

Author: al45tair

lib/Demangling/Demangler.cpp

@@ -1669,6 +1669,7 @@ bool Demangle::nodeConsumesGenericArgs(Node *node) {
     case Node::Kind::Initializer:
     case Node::Kind::PropertyWrapperBackingInitializer:
     case Node::Kind::PropertyWrapperInitFromProjectedValue:
+    case Node::Kind::Static:
       return false;
     default:
       return true;

lib/Demangling/Remangler.cpp

@@ -568,6 +568,7 @@ ManglingError Remangler::mangleGenericArgs(Node *node, char &Separator,
     case Node::Kind::Initializer:
     case Node::Kind::PropertyWrapperBackingInitializer:
     case Node::Kind::PropertyWrapperInitFromProjectedValue:
+    case Node::Kind::Static:
       if (!fullSubstitutionMap)
         break;
 
@@ -3419,6 +3420,7 @@ bool Demangle::isSpecialized(Node *node) {
     case Node::Kind::ModifyAccessor:
     case Node::Kind::UnsafeAddressor:
     case Node::Kind::UnsafeMutableAddressor:
+    case Node::Kind::Static:
       assert(node->getNumChildren() > 0);
       return node->getNumChildren() > 0 && isSpecialized(node->getChild(0));
 
@@ -3455,6 +3457,7 @@ ManglingErrorOr<NodePointer> Demangle::getUnspecialized(Node *node,
     case Node::Kind::PropertyWrapperBackingInitializer:
     case Node::Kind::PropertyWrapperInitFromProjectedValue:
     case Node::Kind::DefaultArgumentInitializer:
+    case Node::Kind::Static:
       NumToCopy = node->getNumChildren();
       LLVM_FALLTHROUGH;
     case Node::Kind::Structure:

test/Demangle/Inputs/manglings.txt

@@ -415,3 +415,4 @@ $s1t10globalFuncyyAA7MyActorCYiF ---> t.globalFunc(isolated t.MyActor) -> ()
 $sSIxip6foobarP ---> foobar in Swift.DefaultIndices.subscript : A
 $s13__lldb_expr_110$10016c2d8yXZ1B10$10016c2e0LLC ---> __lldb_expr_1.(unknown context at $10016c2d8).(B in $10016c2e0)
 $s__TJO ---> $s__TJO
+$s6Foobar7Vector2VAASdRszlE10simdMatrix5scale6rotate9translateSo0C10_double3x3aACySdG_SdAJtFZ0D4TypeL_aySd__GD ---> MatrixType #1 in static (extension in Foobar):Foobar.Vector2<Swift.Double><A where A == Swift.Double>.simdMatrix(scale: Foobar.Vector2<Swift.Double>, rotate: Swift.Double, translate: Foobar.Vector2<Swift.Double>) -> __C.simd_double3x3