[libclc] libclc: erfc: fix fp32 implementation (PR #132390)

[Fraser Cormack via cfe-commits]

================
@@ -131,7 +131,8 @@ _CLC_OVERLOAD _CLC_DEF float erfc(float x) {
     float ret = 0.0f;
 
     float z = as_float(ix & 0xfffff000);
-    float r = exp(mad(-z, z, -0.5625f)) * exp(mad(z - absx, z + absx, q));
+    float r = exp(-z * z) * exp(mad(z - absx, z + absx, q));
+    r *= 0x1.23ba94p-1; // exp(-0.5625)
----------------
frasercrmck wrote:

```suggestion
    r *= 0x1.23ba94p-1f; // exp(-0.5625)
```

https://github.com/llvm/llvm-project/pull/132390
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