[compiler-rt] Relax muldc3 test to avoid precision issue (PR #151663)

[Fangrui Song via llvm-commits]

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@@ -15,6 +16,19 @@ __muldc3(double __a, double __b, double __c, double __d);
 
 enum {zero, non_zero, inf, NaN, non_zero_nan};
 
+int check_complex_equal(double _Complex r1, double _Complex r2)
+{
+    double max_magnitude = fmax(cabs(r1), cabs(r2));
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MaskRay wrote:

The file doesn't utilize the modern coding style within compiler-rt.

For new code, use 2-space indentation.

https://github.com/llvm/llvm-project/pull/151663