core, core/vm: added gas price variance table

This implements 1b & 1c of EIP150 by adding a new GasTable which must be
returned from the RuleSet config method. This table is used to determine
the gas prices for the current epoch.

Please note that when the CreateBySuicide gas price is set it is assumed
that we're in the new epoch phase.

In addition this PR will serve as temporary basis while refactorisation
in being done in the EVM64 PR, which will substentially overhaul the gas
price code.

1 files changed, 4 insertions, 2 deletions

diff --git a/params/util.go b/params/util.go
index 9d1fa54e6..863fbe68b 100644
--- a/params/util.go
+++ b/params/util.go
@@ -19,6 +19,8 @@ package params
 import "math/big"
 
 var (
-	TestNetHomesteadBlock = big.NewInt(494000)  // Testnet homestead block
-	MainNetHomesteadBlock = big.NewInt(1150000) // Mainnet homestead block
+	TestNetHomesteadBlock           = big.NewInt(494000)  // Testnet homestead block
+	MainNetHomesteadBlock           = big.NewInt(1150000) // Mainnet homestead block
+	TestNetHomesteadGasRepriceBlock = big.NewInt(1783000) // Test net gas reprice block
+	MainNetHomesteadGasRepriceBlock = big.NewInt(2457000) // Main net gas reprice block
 )