Revert of [turbofan] Add alignment parameter to StackSlot operator

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

Index: src/compiler/mips/code-generator-mips.cc
diff --git a/src/compiler/mips/code-generator-mips.cc b/src/compiler/mips/code-generator-mips.cc
index 18a8c293e4f1cca4b0a383c68eceea92e4212ab3..476099e5cfedce23c01792ccef2832ab450ffb80 100644
--- a/src/compiler/mips/code-generator-mips.cc
+++ b/src/compiler/mips/code-generator-mips.cc
@@ -775,35 +775,8 @@
     case kArchStackSlot: {
       FrameOffset offset =
           frame_access_state()->GetFrameOffset(i.InputInt32(0));
-      Register base_reg = offset.from_stack_pointer() ? sp : fp;
-      __ Addu(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;
-        __ Addu(kScratchReg, base_reg, Operand(offset.offset()));
-        __ And(kScratchReg, kScratchReg, Operand(alignment - 1));
-        __ BranchShort(&done, eq, kScratchReg, Operand(zero_reg));
-        __ Addu(i.OutputRegister(), i.OutputRegister(), kPointerSize);
-        __ bind(&done);
-      } else if (alignment > 2 * kPointerSize) {
-        Label done;
-        __ Addu(kScratchReg, base_reg, Operand(offset.offset()));
-        __ And(kScratchReg, kScratchReg, Operand(alignment - 1));
-        __ BranchShort(&done, eq, kScratchReg, Operand(zero_reg));
-        __ li(kScratchReg2, alignment);
-        __ Subu(kScratchReg2, kScratchReg2, Operand(kScratchReg));
-        __ Addu(i.OutputRegister(), i.OutputRegister(), kScratchReg2);
-        __ bind(&done);
-      }
+      __ Addu(i.OutputRegister(), offset.from_stack_pointer() ? sp : fp,
+              Operand(offset.offset()));
       break;
     }
     case kIeee754Float64Acos: