Add some more #[inline] annotations for trivial functions (#2817)

Looking at some profiles these or their related functions were all
showing up, so this commit adds `#[inline]` to allow cross-crate
inlining by default.

crates/environ/src/vmoffsets.rs

@@ -44,6 +44,7 @@ fn cast_to_u32(sz: usize) -> u32 {
 }
 
 /// Align an offset used in this module to a specific byte-width by rounding up
+#[inline]
 fn align(offset: u32, width: u32) -> u32 {
     (offset + (width - 1)) / width * width
 }