[turbofan] Correct regalloc blocked register behavior

test/mjsunit/regress/regress-5888.js

Index: test/mjsunit/regress/regress-5888.js
diff --git a/test/mjsunit/regress/regress-5888.js b/test/mjsunit/regress/regress-5888.js
new file mode 100644
index 0000000000000000000000000000000000000000..0725ac428534a2057da48769904305201a912bd9
--- /dev/null
+++ b/test/mjsunit/regress/regress-5888.js
@@ -0,0 +1,76 @@
+// Copyright 2017 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+load("test/mjsunit/wasm/wasm-constants.js");
+load("test/mjsunit/wasm/wasm-module-builder.js");
+
+(function() {
+  var builder = new WasmModuleBuilder();
+  builder.addMemory(32, 32, false);
+  builder.addFunction("test", kSig_i_iii)
+    .addBodyWithEnd([
+// body:
+kExprI64Const, 0xb4, 0x42,
+kExprI64Const, 0x7a,
+kExprI64Const, 0x42,
+kExprI64Const, 0x7a,
+kExprI64Ior,
+kExprI64Ctz,
+kExprI64Ctz,
+kExprI64Shl,
+kExprI64Mul,
+kExprI64Const, 0x41,
+kExprI64Ctz,
+kExprI64Ctz,
+kExprI64Shl,
+kExprF32SConvertI64,
+kExprI64Const, 0x42,
+kExprI64Const, 0x02,
+kExprI64Const, 0x7a,
+kExprI64Mul,
+kExprI64Const, 0x42,
+kExprI64Ctz,
+kExprI64Shl,
+kExprI64Const, 0x7a,
+kExprI64Ctz,
+kExprI64Shl,
+kExprI64Mul,
+kExprI64Const, 0x41,
+kExprI64Ctz,
+kExprI64Ctz,
+kExprI64Shl,
+kExprF32SConvertI64,
+kExprUnreachable,
+kExprEnd,   // @65
+            ])
+            .exportFunc();
+  var module = new WebAssembly.Module(builder.toBuffer());
+})();
+
+(function() {
+  var builder = new WasmModuleBuilder();
+  builder.addMemory(16, 32, false);
+  builder.addFunction("test", kSig_i_iii)
+    .addBodyWithEnd([
+      // body:
+      kExprI64Const, 0x42,
+      kExprI64Const, 0x7a,
+      kExprI64Ctz,
+      kExprI64Mul,
+      kExprI64Ctz,
+      kExprI64Const, 0x41,
+      kExprI64Ctz,
+      kExprI64Ctz,
+      kExprI64Shl,
+      kExprI64Const, 0x41,
+      kExprI64Ctz,
+      kExprI64Ctz,
+      kExprI64Shl,
+      kExprF32SConvertI64,
+      kExprUnreachable,
+      kExprEnd,   // @20
+    ])
+    .exportFunc();
+  var module = new WebAssembly.Module(builder.toBuffer());
+})();