[NFC] Move HeapType::isBottom() to header (WebAssembly#7150)

This makes Precompute about 5% faster on a WasmGC binary.

Inspired by WebAssembly#6931.

Author: tlively

src/wasm-type.h

@@ -870,6 +870,33 @@ std::ostream& operator<<(std::ostream&, Struct);
 std::ostream& operator<<(std::ostream&, Array);
 std::ostream& operator<<(std::ostream&, TypeBuilder::ErrorReason);
 
+// Inline some nontrivial methods here for performance reasons.
+
+inline bool HeapType::isBottom() const {
+  if (isBasic()) {
+    switch (getBasic(Unshared)) {
+      case ext:
+      case func:
+      case cont:
+      case any:
+      case eq:
+      case i31:
+      case struct_:
+      case array:
+      case exn:
+      case string:
+        return false;
+      case none:
+      case noext:
+      case nofunc:
+      case nocont:
+      case noexn:
+        return true;
+    }
+  }
+  return false;
+}
+
 } // namespace wasm
 
 namespace std {

src/wasm/wasm-type.cpp

@@ -866,31 +866,6 @@ HeapTypeKind HeapType::getKind() const {
   return getHeapTypeInfo(*this)->kind;
 }
 
-bool HeapType::isBottom() const {
-  if (isBasic()) {
-    switch (getBasic(Unshared)) {
-      case ext:
-      case func:
-      case cont:
-      case any:
-      case eq:
-      case i31:
-      case struct_:
-      case array:
-      case exn:
-      case string:
-        return false;
-      case none:
-      case noext:
-      case nofunc:
-      case nocont:
-      case noexn:
-        return true;
-    }
-  }
-  return false;
-}
-
 bool HeapType::isOpen() const {
   if (isBasic()) {
     return false;