Build mips64r6 target with GCC.

Use GCC instead of Clang, as the latter generates too large
a stack frame for dex2oat's `main`.

Bug: 27310199
Change-Id: I58d119618292eed2865b15a90239fa6a60779d61
1 file changed
tree: af2843e59743c8827e70afe0c2435613999b1136
  1. arm_krait/
  2. armv8/
  3. mips32r2_fp/
  4. mips32r2_fp_xburst/
  5. mips64r6/
  6. silvermont/