[intrinsic] Drop the %_ValueOf intrinsic.

src/code-stub-assembler.h

Index: src/code-stub-assembler.h
diff --git a/src/code-stub-assembler.h b/src/code-stub-assembler.h
index f29701020791ffe5f67d9099c2236a2b4836d204..a3460f797e5385cfe76e29f55449a478f48181c1 100644
--- a/src/code-stub-assembler.h
+++ b/src/code-stub-assembler.h
@@ -17,6 +17,8 @@ class CallInterfaceDescriptor;
 class StatsCounter;
 class StubCache;
 
+enum class PrimitiveType { kBoolean, kNumber, kString, kSymbol };
+
 // Provides JavaScript-specific "macro-assembler" functionality on top of the
 // CodeAssembler. By factoring the JavaScript-isms out of the CodeAssembler,
 // it's possible to add JavaScript-specific useful CodeAssembler "macros"
@@ -251,6 +253,12 @@ class CodeStubAssembler : public compiler::CodeAssembler {
   // or returns the {value} converted to a String otherwise.
   compiler::Node* ToThisString(compiler::Node* context, compiler::Node* value,
                                char const* method_name);
+  // Throws a TypeError for {method_name} if {value} is neither of the given
+  // {primitive_type} nor a JSValue wrapping a value of {primitive_type}, or
+  // returns the {value} (or wrapped value) otherwise.
+  compiler::Node* ToThisValue(compiler::Node* context, compiler::Node* value,
+                              PrimitiveType primitive_type,
+                              char const* method_name);
 
   // String helpers.
   // Load a character from a String (might flatten a ConsString).