PPC: Array constructor failed to enter it's function execution context.

Port d2f78c6b

Original commit message:
    This becomes visible if an exception is thrown by the constructor.
    We do this on "new Array(3.5)", throwing a RangeError.

R=mvstanton@chromium.org, joransiu@ca.ibm.com, jyan@ca.ibm.com, michael_dawson@ca.ibm.com
BUG=

Review URL: https://codereview.chromium.org/1484423003

Cr-Commit-Position: refs/heads/master@{#32480}

src/ppc/code-stubs-ppc.cc

@@ -5013,6 +5013,9 @@ void ArrayConstructorStub::Generate(MacroAssembler* masm) {
     __ AssertUndefinedOrAllocationSite(r5, r7);
   }
 
+  // Enter the context of the Array function.
+  __ LoadP(cp, FieldMemOperand(r4, JSFunction::kContextOffset));
+
   Label subclassing;
   __ cmp(r6, r4);
   __ bne(&subclassing);