Restored -funsafe-loop-optimizations to subconfigs.

Details:
- Restored use of -funsafe-loop-optimizations in the definitions of
  CRVECFLAGS (when using gcc), but only for sub-configurations (and
  not configuration families such as amd64, intel64, and x86_64).
  This more or less reverts 5190d05 and 6cf1550.

config/bulldozer/make_defs.mk

@@ -75,7 +75,7 @@ endif
 # Flags specific to reference kernels.
 CROPTFLAGS     := $(CKOPTFLAGS)
 ifeq ($(CC_VENDOR),gcc)
-CRVECFLAGS     := $(CKVECFLAGS)
+CRVECFLAGS     := $(CKVECFLAGS) -funsafe-loop-optimizations
 else
 CRVECFLAGS     := $(CKVECFLAGS)
 endif

config/excavator/make_defs.mk

@@ -75,7 +75,7 @@ endif
 # Flags specific to reference kernels.
 CROPTFLAGS     := $(CKOPTFLAGS)
 ifeq ($(CC_VENDOR),gcc)
-CRVECFLAGS     := $(CKVECFLAGS)
+CRVECFLAGS     := $(CKVECFLAGS) -funsafe-loop-optimizations
 else
 CRVECFLAGS     := $(CKVECFLAGS)
 endif

config/haswell/make_defs.mk

@@ -79,7 +79,7 @@ endif
 # Flags specific to reference kernels.
 CROPTFLAGS     := $(CKOPTFLAGS)
 ifeq ($(CC_VENDOR),gcc)
-CRVECFLAGS     := $(CKVECFLAGS)
+CRVECFLAGS     := $(CKVECFLAGS) -funsafe-loop-optimizations
 else
 CRVECFLAGS     := $(CKVECFLAGS)
 endif

config/knc/make_defs.mk

@@ -71,7 +71,7 @@ endif
 # Flags specific to reference kernels.
 CROPTFLAGS     := $(CKOPTFLAGS)
 ifeq ($(CC_VENDOR),gcc)
-CRVECFLAGS     := $(CKVECFLAGS)
+CRVECFLAGS     := $(CKVECFLAGS) -funsafe-loop-optimizations
 else
 CRVECFLAGS     := $(CKVECFLAGS)
 endif

config/knl/make_defs.mk

@@ -99,7 +99,7 @@ endif
 # Note: We use AVX2 for reference kernels instead of AVX-512.
 CROPTFLAGS     := $(CKOPTFLAGS)
 ifeq ($(CC_VENDOR),gcc)
-CRVECFLAGS     := -march=knl -mno-avx512f -mno-avx512pf -mno-avx512er -mno-avx512cd
+CRVECFLAGS     := -march=knl -mno-avx512f -mno-avx512pf -mno-avx512er -mno-avx512cd -funsafe-loop-optimizations
 else
 ifeq ($(CC_VENDOR),icc)
 CRVECFLAGS     := -xMIC-AVX512

config/penryn/make_defs.mk

@@ -79,7 +79,7 @@ endif
 # Flags specific to reference kernels.
 CROPTFLAGS     := $(CKOPTFLAGS)
 ifeq ($(CC_VENDOR),gcc)
-CRVECFLAGS     := $(CKVECFLAGS)
+CRVECFLAGS     := $(CKVECFLAGS) -funsafe-loop-optimizations
 else
 CRVECFLAGS     := $(CKVECFLAGS)
 endif

config/piledriver/make_defs.mk

@@ -75,7 +75,7 @@ endif
 # Flags specific to reference kernels.
 CROPTFLAGS     := $(CKOPTFLAGS)
 ifeq ($(CC_VENDOR),gcc)
-CRVECFLAGS     := $(CKVECFLAGS)
+CRVECFLAGS     := $(CKVECFLAGS) -funsafe-loop-optimizations
 else
 CRVECFLAGS     := $(CKVECFLAGS)
 endif

config/sandybridge/make_defs.mk

@@ -79,7 +79,7 @@ endif
 # Flags specific to reference kernels.
 CROPTFLAGS     := $(CKOPTFLAGS)
 ifeq ($(CC_VENDOR),gcc)
-CRVECFLAGS     := $(CKVECFLAGS)
+CRVECFLAGS     := $(CKVECFLAGS) -funsafe-loop-optimizations
 else
 CRVECFLAGS     := $(CKVECFLAGS)
 endif

config/skx/make_defs.mk

@@ -89,7 +89,7 @@ endif
 # to overcome the AVX-512 frequency drop". (Issue #187)
 CROPTFLAGS     := $(CKOPTFLAGS)
 ifeq ($(CC_VENDOR),gcc)
-CRVECFLAGS     := -march=skylake-avx512 -mno-avx512f -mno-avx512vl -mno-avx512bw -mno-avx512dq -mno-avx512cd
+CRVECFLAGS     := -march=skylake-avx512 -mno-avx512f -mno-avx512vl -mno-avx512bw -mno-avx512dq -mno-avx512cd -funsafe-loop-optimizations
 else
 ifeq ($(CC_VENDOR),icc)
 CRVECFLAGS     := -xCORE-AVX2

config/steamroller/make_defs.mk

@@ -75,7 +75,7 @@ endif
 # Flags specific to reference kernels.
 CROPTFLAGS     := $(CKOPTFLAGS)
 ifeq ($(CC_VENDOR),gcc)
-CRVECFLAGS     := $(CKVECFLAGS)
+CRVECFLAGS     := $(CKVECFLAGS) -funsafe-loop-optimizations
 else
 CRVECFLAGS     := $(CKVECFLAGS)
 endif

config/zen/make_defs.mk

@@ -62,7 +62,7 @@ endif
 # Flags specific to reference kernels.
 CROPTFLAGS     := $(CKOPTFLAGS)
 ifeq ($(CC_VENDOR),gcc)
-CRVECFLAGS     := $(CKVECFLAGS)
+CRVECFLAGS     := $(CKVECFLAGS) -funsafe-loop-optimizations
 else
 CRVECFLAGS     := $(CKVECFLAGS)
 endif