Revert of [turbofan] Add alignment parameter to StackSlot operator

src/compiler/mips64/code-generator-mips64.cc

Index: src/compiler/mips64/code-generator-mips64.cc
diff --git a/src/compiler/mips64/code-generator-mips64.cc b/src/compiler/mips64/code-generator-mips64.cc
index 0c894116a3c173047158880b0496f7c17c8db15c..5250541efd7e1987971b8e639d5dce6411584f15 100644
--- a/src/compiler/mips64/code-generator-mips64.cc
+++ b/src/compiler/mips64/code-generator-mips64.cc
@@ -813,35 +813,8 @@
     case kArchStackSlot: {
       FrameOffset offset =
           frame_access_state()->GetFrameOffset(i.InputInt32(0));
-      Register base_reg = offset.from_stack_pointer() ? sp : fp;
-      __ Daddu(i.OutputRegister(), base_reg, Operand(offset.offset()));
-      int alignment = i.InputInt32(1);
-      DCHECK(alignment == 0 || alignment == 4 || alignment == 8 ||
-             alignment == 16);
-      if (FLAG_debug_code && alignment > 0) {
-        // Verify that the output_register is properly aligned
-        __ And(kScratchReg, i.OutputRegister(), Operand(kPointerSize - 1));
-        __ Assert(eq, kAllocationIsNotDoubleAligned, kScratchReg,
-                  Operand(zero_reg));
-      }
-      if (alignment == 2 * kPointerSize) {
-        Label done;
-        __ Daddu(kScratchReg, base_reg, Operand(offset.offset()));
-        __ And(kScratchReg, kScratchReg, Operand(alignment - 1));
-        __ BranchShort(&done, eq, kScratchReg, Operand(zero_reg));
-        __ Daddu(i.OutputRegister(), i.OutputRegister(), kPointerSize);
-        __ bind(&done);
-      } else if (alignment > 2 * kPointerSize) {
-        Label done;
-        __ Daddu(kScratchReg, base_reg, Operand(offset.offset()));
-        __ And(kScratchReg, kScratchReg, Operand(alignment - 1));
-        __ BranchShort(&done, eq, kScratchReg, Operand(zero_reg));
-        __ li(kScratchReg2, alignment);
-        __ Dsubu(kScratchReg2, kScratchReg2, Operand(kScratchReg));
-        __ Daddu(i.OutputRegister(), i.OutputRegister(), kScratchReg2);
-        __ bind(&done);
-      }
-
+      __ Daddu(i.OutputRegister(), offset.from_stack_pointer() ? sp : fp,
+               Operand(offset.offset()));
       break;
     }
     case kIeee754Float64Acos: