[ping] RFR(M): 8160245: C1: Clean up platform #defines in c1_LIR.hpp.

[Lindenmaier, Goetz]

Hi,

could someone please have a look at this issue? I recap the description
below, and I also updated the webrev which would no more apply to
hs-comp:

c1_LIR.hpp defines a row of functions guarded by platform
defines. This is bad style and hinders new platform ports.
(I'm working on S390 aka Z :))

This change removes the majority of these defines. It introduces
common headers, and moves implementations to c1_LIR_<cpu>.cpp files.

It guards single_softfp() and double_softfp() by __SOFTFP__.
This is not used in any openJdk platform. I can not test this
on the closed platforms ARM32 and PPC32.

It removes the guard around the LIR_Address constructor. There
is no point in guarding this code, verify() assures by
assertions that it can not be misused. I also introduce a new
constructor that leaves out the scale argument and introduce
some usages on X86.

This change also moves verify() to the new platform files. In the
header, LIR_ADDRESS_PD_VERIFY was used to guard usage
of pd_verify(). Neither of these are used in openJdk. If this define
is used in the closed ports pd_verify() must be renamed to verify().

The code that was previously guarded by ARM, ARM32 or PPC32 is
moved to a properly guarded section in c1_LIR.cpp. Actually,
it should be moved to according new files c1_LIR_<cpu>.cpp in
the closed ports. But this way the change should basically
work for the closed ports.

I added fnoreg on x86 to note down the code similarly on all
platforms.

I cleaned up a flag with a limited range on PPC_32.

generate_stack_overflow_check() in templateInterpreterGenerator.hpp
is defined with different parameters for the platforms. I added default 
parameters noreg so that the signature is the same for all platforms.

Please review this change. I please need a sponsor.
https://bugs.openjdk.java.net/browse/JDK-8160245
http://cr.openjdk.java.net/~goetz/wr16/8160245-simplifyC1/webrev.02/

I built and tested this on linuxx86_64, solaris_sparc and
the ppc platforms.

Best regards,
  Goetz.