wmake: Added support for the new OneAPI Intel compiler

The icx and icpx Intel compilers are selected by

WM_COMPILER=Icx

These compilers are based on the Clang front-end and hence the configuration
files are based on and nearly identical to those for Clang.

Support for the new OneAPI compilers replaces the now deprecated Intel icc, icpc
compilers.

wmake/rules/linuxPPC64Gcc/c

@@ -13,4 +13,6 @@ ctoo        = $(WM_SCHEDULER) $(cc) $(cFLAGS) -c $< -o $@
 LINK_LIBS   = $(cDBUG)
 
 LINKLIBSO   = $(cc) -fuse-ld=bfd -shared
-LINKEXE     = $(cc) -fuse-ld=bfd -Xlinker --add-needed -Xlinker -z -Xlinker nodefs
+
+LINKEXE     = $(cc) -fuse-ld=bfd \
+              -Xlinker --add-needed -Xlinker -z -Xlinker nodefs

wmake/rules/linuxPPC64Gcc/c++

@@ -1,7 +1,7 @@
 SUFFIXES += .C
 
-c++WARN     = -Wall -Wextra -Wold-style-cast -Wnon-virtual-dtor -Wno-unused-parameter \
-              -Wno-invalid-offsetof -Wno-attributes
+c++WARN     = -Wall -Wextra -Wold-style-cast -Wnon-virtual-dtor \
+              -Wno-unused-parameter -Wno-invalid-offsetof -Wno-attributes
 
 # Suppress some warnings for flex++ and CGAL
 c++LESSWARN = -Wno-old-style-cast -Wno-unused-local-typedefs -Wno-array-bounds
@@ -12,7 +12,8 @@ include $(DEFAULT_RULES)/c++$(WM_COMPILE_OPTION)
 
 ptFLAGS     = -DNoRepository -ftemplate-depth-100
 
-c++FLAGS    = $(GFLAGS) $(c++WARN) $(c++OPT) $(c++DBUG) $(ptFLAGS) $(LIB_HEADER_DIRS) -fPIC
+c++FLAGS    = $(GFLAGS) $(c++WARN) $(c++OPT) $(c++DBUG) $(ptFLAGS) \
+              $(LIB_HEADER_DIRS) -fPIC
 
 Ctoo        = $(WM_SCHEDULER) $(CC) $(c++FLAGS) -c $< -o $@
 cxxtoo      = $(Ctoo)

wmake/rules/linuxPPC64Gcc/c++Opt

@@ -1,4 +1,4 @@
 c++DBUG     =
-c++OPT      = -O3
+c++OPT      = -O3 -fno-tree-slp-vectorize
 
 ROUNDING_MATH = -frounding-math