Fix hipcc for -E

-E is for preprocessing only, which should be compile only.

This is required by enabling sccache.

Change-Id: Ia0a0acb6a04abd03a9cb5b3c13cf7446837f37b4

bin/hipcc

@@ -422,7 +422,7 @@ foreach $arg (@ARGV)
     $trimarg = $arg;
     $trimarg =~ s/^\s+|\s+$//g;  # Remive whitespace
     my $swallowArg = 0;
-    if ($arg eq '-c' or $arg eq '--genco') {
+    if ($arg eq '-c' or $arg eq '--genco' or $arg eq '-E') {
         $compileOnly = 1;
         $needLDFLAGS  = 0;
     }