[gcc r16-2909] gccrs: reconstruct_vec: Allocate size when creating the vector

[Arthur Cohen via Gcc-cvs]

https://gcc.gnu.org/g:1c4521b39702ffae7d737479926cd5e1ab34c564

commit r16-2909-g1c4521b39702ffae7d737479926cd5e1ab34c564
Author: Arthur Cohen <arthur.co...@embecosm.com>
Date:   Mon May 26 11:31:40 2025 +0200

    gccrs: reconstruct_vec: Allocate size when creating the vector
    
    gcc/rust/ChangeLog:
    
            * ast/rust-ast.h (reconstruct_vec): Pre-allocate size of vector.

Diff:
---
 gcc/rust/ast/rust-ast.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/gcc/rust/ast/rust-ast.h b/gcc/rust/ast/rust-ast.h
index ecbc29181300..0d853e744c76 100644
--- a/gcc/rust/ast/rust-ast.h
+++ b/gcc/rust/ast/rust-ast.h
@@ -107,6 +107,7 @@ std::vector<std::unique_ptr<T>>
 reconstruct_vec (const std::vector<std::unique_ptr<T>> &to_reconstruct)
 {
   std::vector<std::unique_ptr<T>> reconstructed;
+  reconstructed.reserve (to_reconstruct.size ());
 
   for (const auto &elt : to_reconstruct)
     reconstructed.emplace_back (std::unique_ptr<T> (elt->reconstruct_impl ()));