[turbofan] Turn Math.clz32 into an inlinable builtin.

test/cctest/test-disasm-x64.cc

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 71 matching lines @@
   __ addq(rsi, Operand(rcx, times_4, 24));
   __ addq(rsi, Operand(rcx, times_4, -4));
   __ addq(rsi, Operand(rcx, times_4, -1999));
   __ nop();
   __ addq(rdi, Operand(rbp, rcx, times_4, 0));
   __ addq(rdi, Operand(rbp, rcx, times_4, 12));
   __ addq(rdi, Operand(rbp, rcx, times_4, -8));
   __ addq(rdi, Operand(rbp, rcx, times_4, -3999));
   __ addq(Operand(rbp, rcx, times_4, 12), Immediate(12));
 
+  __ bsrl(rax, r15);
+  __ bsrl(r9, Operand(rcx, times_8, 91919));
+
   __ nop();
   __ addq(rbx, Immediate(12));
   __ nop();
   __ nop();
   __ andq(rdx, Immediate(3));
   __ andq(rdx, Operand(rsp, 4));
   __ cmpq(rdx, Immediate(3));
   __ cmpq(rdx, Operand(rsp, 4));
   __ cmpq(Operand(rbp, rcx, times_4, 0), Immediate(1000));
   __ cmpb(rbx, Operand(rbp, rcx, times_2, 0));
@@ skipping 494 matching lines @@
 #ifdef OBJECT_PRINT
   OFStream os(stdout);
   code->Print(os);
   byte* begin = code->instruction_start();
   byte* end = begin + code->instruction_size();
   disasm::Disassembler::Disassemble(stdout, begin, end);
 #endif
 }
 
 #undef __