RFR: JDK-8219486: Missing reg_mask_init() breaks x86_32 build

[Roman Kennke]

JDK-8217909 introduced a method reg_mask_init() which is defined only in
x86_64.ad, and thus breaks build (linkage) on x86_32.

I propose to fix this by enclosing the function declaration and call in
#ifdef _LP64. Alternatively I could add an empty reg_mask_init() to
x86_32.ad, but I don't like empty code very much. We might want to
consider to do the with_rbp/no_rbp stuff in x86_32.ad later though. I
don't have enough time & interest to do it right now.

Bug:
https://bugs.openjdk.java.net/browse/JDK-8219486
Webrev:
http://cr.openjdk.java.net/~rkennke/JDK-8219486/webrev.00/

Testing: built 32bit locally, will push through jdk/submit in a minute

Ok?

Roman

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