target/i386: Unify invlpg, invlpga

Use a single helper, flush_page, to do the work.
Use gen_svm_check_intercept.
Perform the zero-extension for invlpga inline.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <20210514151342.384376-43-richard.henderson@linaro.org>
4 files changed