SWDEV-355608 - hipcc: remove -use_fast_math (#2965)

It doesn't seem to provide any functionality, probably leftover from some experimental codes.

Change-Id: I1720ccf29e057d7f2e18a7dfd1adccd3d51fa80c

[ROCm/hip commit: cb084f4072]

projects/hip/bin/hipcc.pl

@@ -358,10 +358,6 @@ foreach $arg (@ARGV)
         $compileOnly = 1;
         $buildDeps = 1;
     }
-    if($trimarg eq '-use_fast_math') {
-        $HIPCXXFLAGS .= " -DHIP_FAST_MATH ";
-        $HIPCFLAGS .= " -DHIP_FAST_MATH ";
-    }
     if(($trimarg eq '-use-staticlib') and ($setLinkType eq 0))
     {
         $linkType = 0;