MIPS: Fix c-linkage.

Per MIPS O32 ABI the first four arguments must be passed via
the a0-a3 registers and they must be on the stack as well.

TEST=cctest/test-run-wasm/*
BUG=

Review URL: https://codereview.chromium.org/1730763002

Cr-Commit-Position: refs/heads/master@{#34260}

src/compiler/c-linkage.cc

@@ -90,6 +90,7 @@ LinkageLocation regloc(Register reg) {
 // ===========================================================================
 // == mips ===================================================================
 // ===========================================================================
+#define STACK_SHADOW_WORDS 4
 #define PARAM_REGISTERS a0, a1, a2, a3
 #define CALLEE_SAVE_REGISTERS                                                  \
   s0.bit() | s1.bit() | s2.bit() | s3.bit() | s4.bit() | s5.bit() | s6.bit() | \