aarch64 support for regalloc_test.cpp

Summary: Make regalloc_test.cpp work for aarch64. Previously it was assuming that this was enough arguments because x86-64 has fewer arguments in registers. Adding a bunch of arguments to ensure it spills.

Reviewed By: jbower-fb

Differential Revision: D91485562

fbshipit-source-id: a231c27fac02efbb7f562b684d5384650319cf54

Author: kddnewton

cinderx/RuntimeTests/regalloc_test.cpp

@@ -219,7 +219,7 @@ BB %8 - succs: %25
   %15 = Add %14, 1
   %16 = Add %15, 1
   %17 = Add %16, 1
-  %18 = Call 1024(0x400), %3, %2, %9, %17
+  %18 = Call 1024(0x400), %3, %2, %9, %12, %13, %14, %15, %16, %17
   %19 = Add %2, %9
   %20 = Add %10, %11
   %21 = Add %20, %13