Revert bpf-tools to version 1.8 because of a codegen bug suspicion (#17568)

sdk/bpf/c/bpf.mk

@@ -15,7 +15,7 @@ OUT_DIR ?= ./out
 OS := $(shell uname)
 
 LLVM_DIR = $(LOCAL_PATH)../dependencies/bpf-tools/llvm
-LLVM_SYSTEM_INC_DIRS := $(LLVM_DIR)/lib/clang/12.0.1/include
+LLVM_SYSTEM_INC_DIRS := $(LLVM_DIR)/lib/clang/11.0.1/include
 COMPILER_RT_DIR = $(LOCAL_PATH)../dependencies/bpf-tools/rust/lib/rustlib/bpfel-unknown-unknown/lib
 
 ifdef LLVM_DIR

sdk/bpf/scripts/install.sh

@@ -92,7 +92,7 @@ if [[ ! -e criterion-$version.md || ! -e criterion ]]; then
 fi
 
 # Install Rust-BPF
-version=v1.9
+version=v1.8
 if [[ ! -e bpf-tools-$version.md || ! -e bpf-tools ]]; then
   (
     set -e

sdk/cargo-build-bpf/src/main.rs

@@ -360,7 +360,7 @@ fn build_bpf_package(config: &Config, target_directory: &Path, package: &cargo_m
     install_if_missing(
         &config,
         "bpf-tools",
-        "v1.9",
+        "v1.8",
         "https://github.com/solana-labs/bpf-tools/releases/download",
         &PathBuf::from(bpf_tools_filename),
     )