RFR: 8348186: C1: Purge fpu_stack_size infrastructure

[Aleksey Shipilev]

There is currently a build failure for x86_32 in mainline due to [JDK-8346038](https://bugs.openjdk.org/browse/JDK-8346038) moving things around. The failure looks like this:


* For target hotspot_variant-server_libjvm_objs_c1_LinearScan_x86.o:
src/hotspot/cpu/x86/c1_LinearScan_x86.cpp: In member function 'void FpuStackAllocator::handle_op1(LIR_Op1*)':
src/hotspot/cpu/x86/c1_LinearScan_x86.cpp:652:12: error: 'class LIR_Op1' has no member named 'set_fpu_stack_size'
  652 | op1->set_fpu_stack_size(sim()->stack_size());
      | ^~~~~~~~~~~~~~~~~~


This does not warrant a fix, given the code is in deprecated x86_32 parts. But we do not need the whole `set_fpu_stack_size` infra to begin with: the last uses were removed by [JDK-8143353](https://bugs.openjdk.org/browse/JDK-8143353) and [JDK-8152907](https://bugs.openjdk.org/browse/JDK-8152907). So we can clean up this part for both x86_64 and x86_32 at once, and fix an easy build failure meanwhile.

Additional testing:
 - [x] linux-x86-server-fastdebug build
 - [x] linux-x86_64-server-fastdebug build

-------------

Commit messages:
 - Fix

Changes: https://git.openjdk.org/jdk/pull/23215/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=23215&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8348186
  Stats: 10 lines in 2 files changed: 0 ins; 10 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/23215.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/23215/head:pull/23215

PR: https://git.openjdk.org/jdk/pull/23215