[CSA] Refactor NonNumberToNumberOrNumeric

We used to have a loop that it was used for JSReceivers. However, this
was not used as a proper loop since at most it would have two loop
iterations. Then, it could be changed to a Branch case.

Since I was refactoring the method, I also de-duplicated code by using
the common code from PlainPrimitiveNonNumberToNumber. In order to do so,
said method was renamed to TryPlain... and was reworked as well.

Bug: v8:6949, v8:10933
Change-Id: I860601a3b9e8bdeed052dcd237a767ac7ed80c92
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2435110
Commit-Queue: Santiago Aboy Solanes <solanes@chromium.org>
Reviewed-by: Ross McIlroy <rmcilroy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#70202}

src/codegen/code-stub-assembler.h

@@ -3672,8 +3672,12 @@ class V8_EXPORT_PRIVATE CodeStubAssembler
       TNode<Object> value, WriteBarrierMode barrier_mode = UPDATE_WRITE_BARRIER,
       int additional_offset = 0);
 
-  // Converts {input} to a number. {input} must be a plain primitve.
-  TNode<Number> PlainPrimitiveNonNumberToNumber(TNode<HeapObject> input);
+  // Converts {input} to a number if {input} is a plain primitve (i.e. String or
+  // Oddball) and stores the result in {var_result}. Otherwise, it bails out to
+  // {if_bailout}.
+  void TryPlainPrimitiveNonNumberToNumber(TNode<HeapObject> input,
+                                          TVariable<Number>* var_result,
+                                          Label* if_bailout);
 };
 
 class V8_EXPORT_PRIVATE CodeStubArguments {