[ObjC] Fix parsing method type encoding strings for 32-bit platforms

Incorrect parsing of method type encoding strings was causing incorrect
function types to be applied to Objective-C method implementations. In
some cases this would result in confusion about which stack locations
specific parameters resided at.

`q`, `Q and `d` were being mapped to `NSInteger`, `NSUInteger` and
`CGFloat` respectively. While this works for 64-bit platforms, the type
aliases refer to 32-bit types on 32-bit platforms.  These type encodings
are explicitly for 64-bit types. To address this `q`, `Q` and `d` are
now mapped to `int64_t`, `uint64_t` and `double` respectively.

`l` and `L` were incorrectly being interpreted as `int64_t` and
`uint64_t`. While `long` is a 64-bit type on 64-bit Apple platforms, the
`l` / `L` type encodings always refer to a 32-bit type.

`S` was mistakenly being mapped to `uint8_t`. It is now `uint16_t` as
intended.

Author: bdash

objectivec/objc.cpp

@@ -295,7 +295,7 @@ std::vector<QualifiedNameOrType> ObjCProcessor::ParseEncodedType(const std::stri
 			nameOrType.type = Type::IntegerType(2, true);
 			break;
 		case 'S':
-			nameOrType.type = Type::IntegerType(1, false);
+			nameOrType.type = Type::IntegerType(2, false);
 			break;
 		case 'i':
 			nameOrType.type = Type::IntegerType(4, true);
@@ -304,27 +304,27 @@ std::vector<QualifiedNameOrType> ObjCProcessor::ParseEncodedType(const std::stri
 			nameOrType.type = Type::IntegerType(4, false);
 			break;
 		case 'l':
-			nameOrType.type = Type::IntegerType(8, true);
+			nameOrType.type = Type::IntegerType(4, true);
 			break;
 		case 'L':
+			nameOrType.type = Type::IntegerType(4, false);
+			break;
+		case 'q':
 			nameOrType.type = Type::IntegerType(8, true);
 			break;
+		case 'Q':
+			nameOrType.type = Type::IntegerType(8, false);
+			break;
 		case 'f':
-			nameOrType.type = Type::IntegerType(4, true);
+			nameOrType.type = Type::FloatType(4);
+			break;
+		case 'd':
+			nameOrType.type = Type::FloatType(8);
 			break;
 		case 'b':
 		case 'B':
 			nameOrType.type = Type::BoolType();
 			break;
-		case 'q':
-			qualifiedName = "NSInteger";
-			break;
-		case 'Q':
-			qualifiedName = "NSUInteger";
-			break;
-		case 'd':
-			qualifiedName = "CGFloat";
-			break;
 		case '*':
 			nameOrType.type = Type::PointerType(m_data->GetAddressSize(), Type::IntegerType(1, true));
 			break;