Rollup merge of #89015 - klensy:escape-def, r=Mark-Simulacrum
Rollup merge of #89015 - klensy:escape-def, r=Mark-Simulacrum

core::ascii::escape_default: reduce struct size

aidancully/rust,graydon/rust,graydon/rust,graydon/rust,graydon/rust,aidancully/rust,graydon/rust,graydon/rust,aidancully/rust,aidancully/rust,aidancully/rust,aidancully/rust