[22.03-LTS-SP4 RC4]-O3 -march=armv8.2-a+sve -fllc-allocate --param branch-prob-threshold=50汇编文件没有产生prf(x)指令

**【标题描述】-O3 -march=armv8.2-a+sve -fllc-allocate --param branch-prob-threshold=50编译的汇编文件里没有产生prf(x)指令**

**一、缺陷信息**
**【环境信息】**
软件信息
- OS版本及分支信息:openEuler-22.03-LTS-SP4
- 内核信息:5.10.0-208.0.0.108.oe2203sp4.aarch64
- 发现问题的组件版本信息:gcc-10.3.1-60.oe2203sp4.aarch64
```
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/libexec/gcc/aarch64-linux-gnu/10.3.1/lto-wrapper
Target: aarch64-linux-gnu
Configured with: ../configure --prefix=/usr --mandir=/usr/share/man --infodir=/usr/share/info --enable-shared --enable-threads=posix --enable-checking=release --with-system-zlib --enable-__cxa_atexit --disable-libunwind-exceptions --enable-gnu-unique-object --enable-linker-build-id --with-linker-hash-style=gnu --enable-languages=c,c++,fortran,objc,obj-c++,lto --enable-plugin --enable-initfini-array --disable-libgcj --without-cloog --enable-gnu-indirect-function --build=aarch64-linux-gnu --with-stage1-ldflags=' -Wl,-z,relro,-z,now' --with-boot-ldflags=' -Wl,-z,relro,-z,now' --disable-bootstrap --without-isl --with-multilib-list=lp64 --enable-bolt
Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 10.3.1 (GCC)
```
**【问题复现步骤】**
```
/usr/bin/gfortran eva_script42.f90 pcm.c -o elf -O3 -march=armv8.2-a+sve  -static -g -v -fllc-allocate -save-temps --param branch-prob-threshold=50 > /dev/nell 2>&1
grep -Prn '^\tprf' *.s
```
**【实际结果】**
![输入图片说明](https://foruda.gitee.com/images/1719401759256972184/f50a45cf_10666732.png "屏幕截图")
正确结果如下：
![输入图片说明](https://foruda.gitee.com/images/1718611855858503784/4f01fac3_10666732.png "屏幕截图")

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